回転衝撃下における脳の応力分布 : びまん性軸索損傷の有限要素解析

概要

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The mechanism of diffuse axonal injury (DAI) has been analyzed by means of computer simulations. A standard human model that reproduced the human head structure, and modified human models with some head substructures such as falx cerebri eliminated are constructed as finite element models. Rotational impacts are applied to the finite element models through the cranium. The bottom of the third ventricle is considered to be deemed the center of rotation. The rotational impact data of the standard human model evaluated from shear stresses such as von Mises stress show that those stresses are concentrated on the corpus callosum, thalamus and rostral brain stem located at the central region of the brain, which agrees very well with regions of DAI indicated by small hemorrhages found by clinical findings. The cause of the concentration of shear stress is investigated using the modified human models, and it is found that the high shear stress on periventricle such as the corpus callosum and thalamus is affected by the falx cerebri, while the high stress on the rostral brain stem is affected by the tentorium cerebelli. It is deduced that the mechanism of DAI is independent of the type of impact, and the shear stress is concentrated in the central region of the brain due to the effect of the head structure.
一般社団法人日本機械学会の論文
1996-09-25